Mentioning people by names is closer to the natural language the way I use it, also I don’t like feeling useless barriers in my communication. Once upon a times Facebook showed me a dialog asking if I’d like to use only first names when @mentioning people, I picked “Surely, I do” option and it never happened. Though, I knew the function exists somewhere. A few days ago I’ve discovered how to do that.
1. As usual everything starts with typing ‘@’ and a few characters from the name
2. After clicking on the right person, I’ve got a full name highlighted by Facebook
3. Then I put the cursor after the name and press Backspace (Delete on Mac)